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Temporary 5ealina of the Mine Ooeninps <br />' Temporary seals would only be constructed at the portals in very <br />special circumstances such as to seal a mine fire. If ever used, <br />the construction of the seals would be similar to seals used <br />underground. A double row of solid concrete cinder block is <br />keyed into the ribs, roof and floor to provide good anchoring. <br />All contacts with the roof, ribs and floor will be coated with <br />block sealer. The block is laid in a transverse pattern as shown <br />on the following page. All joints are mortared and all vertical <br />joints are offset. The pilaster shown in the drawing will only <br />be added for entries over 16 ft. in width or aver 10 ft. in <br />height. <br />r <br />LJ <br />• <br />530 <br />